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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 39 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.19² =
  2. 2.59² =
  3. 3.19² =
  4. 4.29² =
  5. 5.79² =
  6. 6.39² =
  7. 7.79² =
  8. 8.61² =
  9. 9.69² =
  10. 10.29² =
  11. 11.21² =
  12. 12.39² =
  13. 13.91² =
  14. 14.49² =
  15. 15.39² =
  16. 16.71² =
  17. 17.49² =
  18. 18.79² =
  19. 19.81² =
  20. 20.41² =
  21. 21.79² =
  22. 22.39² =
  23. 23.89² =
  24. 24.79² =
  25. 25.49² =
  26. 26.59² =
  27. 27.81² =
  28. 28.81² =
  29. 29.91² =
  30. 30.29² =
  31. 31.59² =
  32. 32.49² =
  33. 33.59² =
  34. 34.19² =
  35. 35.91² =
  36. 36.51² =
  37. 37.89² =
  38. 38.51² =
  39. 39.39² =
  40. 40.39² =

Answer key

  1. 361
  2. 3481
  3. 361
  4. 841
  5. 6241
  6. 1521
  7. 6241
  8. 3721
  9. 4761
  10. 841
  11. 441
  12. 1521
  13. 8281
  14. 2401
  15. 1521
  16. 5041
  17. 2401
  18. 6241
  19. 6561
  20. 1681
  21. 6241
  22. 1521
  23. 7921
  24. 6241
  25. 2401
  26. 3481
  27. 6561
  28. 6561
  29. 8281
  30. 841
  31. 3481
  32. 2401
  33. 3481
  34. 361
  35. 8281
  36. 2601
  37. 7921
  38. 2601
  39. 1521
  40. 1521

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